https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70223
--- Comment #2 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> ---
The ARM port does not use frame pointers unless specified on the command line
or an actual need in the program (read alloca).
With 4.8.5 I get with the command line options suggested *and*
-fno-omit-frame-pointer which seems to be missed in the options provided in the
PR, a number of which are completely redundant :
readStream:
@ args = 0, pretend = 0, frame = 8
@ frame_needed = 1, uses_anonymous_args = 0
stmfd sp!, {fp, lr}
add fp, sp, #4
sub sp, sp, #16
mov lr, #0
sub r1, fp, #4
mov r2, #22
movw ip, #:lower16:doStreamReadBlock
ldr r3, [r0]
movt ip, #:upper16:doStreamReadBlock
strb lr, [r1, #-1]!
str r2, [sp]
mov r2, #1
blx ip
ldrb r0, [fp, #-5] @ zero_extendqisi2
sub sp, fp, #4
@ sp needed
ldmfd sp!, {fp, pc}
Not sure what's going on yet, probably worth a bisect / search between versions
of the compiler in the 4.8 tree ...
Note also that I don't see the problem on the 4.9, 5.X and trunk with the
testcase provided.
